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Humidity in St. Louis

Missouri author Mark Twain famously said, “If you don’t like the weather in New England, just wait a few minutes.” The same can be said for St. Louis, Missouri, where the weather can be unpredictable and can change rapidly.


Located near the geographic center of the US, St. Louis sits at the confluence of the Mississippi and Missouri Rivers. Due to its location in the middle latitudes, the region is prone to both cold air masses from Canada and warm moist air masses from the Gulf of Mexico. As a result, the area experiences a wide range of weather conditions.

St. Louis has four distinct seasons: hot and muggy summers, cool and wet falls, chilly and damp winters, and wet springs. However, because St. Louis is affected by weather fronts that come in from other regions of the country, it is not uncommon to experience a 60-degree day in January.

St. Louis experiences extreme weather events, such as summer heat waves, cold winter snaps, tornadoes, and flooding due to its flat, inland location. Therefore, it’s important for residents to stay prepared for any weather changes and to take necessary precautions to stay safe during extreme weather conditions.


St. Louis Climate Facts

  • Hottest Month: July (87 degrees Fahrenheit/27 degrees Celsius)

  • Coldest Month: January (39 degrees Fahrenheit/4 degrees Celsius)

  • Wettest Month: May (4.90 inches)


St. Louis is no stranger to the effects of its ever-changing weather, and one of the most noticeable side effects is humidity. Summers in St. Louis can be sticky and sweaty, while winters are often chilly and damp, leaving people’s skin feeling dry and reptilian.

The humidity in St. Louis can range anywhere from 15% to 95%, making it essential for homes to be prepared. Whole-home humidifiers and dehumidifiers can be the solution to many of the problems caused by the region’s erratic weather.

Humidifiers provide a host of benefits to your health, home, and wallet. They can lower the risk of infection by preventing the spread of bacteria and moisturizing the throat, sinuses, and nose. Moist indoor air can also reduce static electricity, relieve dry skin, and promote better sleep. All of these benefits lead to lower heating bills and increase the lifespan of your furniture and appliances.

On the other hand, dehumidifiers can help reduce problems caused by excessive humidity. High humidity levels (50% or higher) in your home can be uncomfortable and damaging to your property. Dehumidifiers can help lower moisture levels and reduce allergies, asthma, mold, and mildew odors. They can also prevent corrosion on tools and electronics caused by humidity. Additionally, they act as natural deterrents to small insects that thrive in damp, humid environments, preventing them from invading your home.

Whether you’re dealing with too much or too little humidity in your home, there is a solution. Humidifiers and dehumidifiers can improve your health and comfort, extend the life of your furniture and appliances, and lower your energy costs by helping your air conditioner and furnace run more efficiently.


HEATING, COOLING & Plumbing Specialists

Providing 5-Star Service in St. Louis, MO.

HEATING, COOLING & Plumbing Specialists

(636) 887-2800: Call or Text


325 Mid Rivers Mall Dr. St. Peters, MO 63376


Monday - Friday: 8:00am - 7:00pm

Saturday: 9:00am - 5:00pm

Sunday: Closed